PPT-Soil Water Potential Measurement

Douglas R Cobos PhD Decagon Devices and Washington State University Background About the presenter PhD in Soil Physics 2003 University of Minnesota Director of Research and Development Decagon Devices Inc. Doug Cobos Ph.D.. Decagon Devices. . and Washington State University. Background. About the presenter. Ph.D. in Soil Physics, 2003, University of Minnesota. Director of Research and Development, Decagon Devices, Inc.. Doug . Cobos, Ph.D.. Decagon Devices and Washington State University. Two Variables are Needed to Describe the State of Water. Water content. and. Quantity . Extent . . . Related Measures. (. WA) Maps and Reports from Web Soil Survey. http://websoilsurvey.nrcs.usda.gov/app/. Contact:. Brad Duncan. Assistant State Soil Scientist. Spokane NRCS State Office. Brad.Duncan@wa.usda.gov. 509-323-2982. Improving accuracy of dielectric soil moisture sensors. Douglas R. . Cobos. , Ph.D.. Decagon Devices and . Washington State University . Outline. Introduction. VWC definition. Direct vs. indirect measurement methods. Doug . Cobos, Ph.D.. Decagon Devices and Washington State University. Two Variables are Needed to Describe the State of Water. Water content. and. Quantity . Extent . . . Related Measures. By the end of this section you will be able..... To name and explain the causes of soil erosion.. Describe in detail how human activities can cause soil erosion.. Name and explain the primary methods of soil conservation.. Are they different? and . Do they matter?. Susan Andrews, National Leader. Soil Quality and Ecosystems. National Soil Survey Center. August 9. , . 2012. Soil Quality Definitions. “fitness for use”. http://www.neosci.com/demos/10-1041_cell processes/Presentation Images/tutorials/3.01.jpg. Pressure potential . ψ. p. . =. amount . of pressure on the container surrounding the . solution. Water is less likely to move. Soil water retention curve. The relationship between soil matric potential and soil water content. “matric suction” = - soil matric potential. Usually soil volumetric water content is used. Usually determined based on empirical data. 1are people on the earthMillions of species and billions of organisms151bacteria algae microscopic insects -tion of biomass anywhere on the planet Microbes which make up only one half of one percent o A . number. A . unit. Example: . 5. cm. Scientists (and we will) use the SI system. Système. International . d’unités. The SI units = METRIC. There are only 3 countries in the whole world using the ENGLISH SYSTEM of measurement. . Rani Abraham. Syllabus portions. The . chemistry of . processes in Lithosphere; Redox status in soil. . pE. pH predominance diagrams for . redox sensitive . elements. Acidity in soil materials. Acid neutralization capacity and . Aim: . To record soil temperature at different depths and computation of soil heat flux. Instruments required. : . Soil thermometer for 5,10, and 20cm depths. Computation of soil heat flux (. q. T. ). Soil . is the thin layer of organic and inorganic materials that covers the Earth's rocky surface. . Soil . is composed of particles of broken rock that have been altered by chemical and mechanical processes that include weathering and erosion. Soil consists of major components – .